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Yu-Shiba-Rusinov bound states versus topological edge states in Pb/Si(111)

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Abstract

There is presently a tremendous activity around the field of topological superconductivity and Majorana fermions. Among the many questions raised, it has become increasingly important to establish the topological or non-topological origin of features associated with Majorana fermions such as zero-bias peaks. Here, we compare in-gap features associated either with isolated magnetic impurities or with magnetic clusters strongly coupled to the atomically thin superconductor Pb/Si(111). We study this system by means of scanning tunneling microscopy and spectroscopy (STM/STS). We take advantage of the fact that the Pb/Si(111) monolayer can exist either in a crystal-ordered phase or in an incommensurate disordered phase to compare the observed spectroscopic features in both phases. This allows us to demonstrate that the strongly resolved in-gap states we found around the magnetic clusters in the disordered phase of Pb have a clear topological origin.

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Authors and Affiliations

  1. Institut des Nanosciences de Paris, Université Pierre et Marie Curie (UPMC), CNRS-UMR 7588, 4 place Jussieu, 75252, Paris, France

    Gerbold C. Ménard, Christophe Brun, Raphaël Leriche, François Debontridder, Dominique Demaille, Dimitri Roditchev & Tristan Cren

  2. Center for Quantum Devices and Station Q Copenhagen, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen, Denmark

    Gerbold C. Ménard

  3. Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405, Orsay Cedex, France

    Mircea Trif & Pascal Simon

  4. Institute for Interdisciplinary Information Sciences, Tsinghua University, Beijing, P.R. China

    Mircea Trif

  5. Laboratoire de physique et d’étude des matériaux, LPEM-UMR8213/CNRS-ESPCI ParisTech-UPMC, 10 rue Vauquelin, 75005, Paris, France

    Dimitri Roditchev

Authors
  1. Gerbold C. Ménard
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  2. Christophe Brun
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  3. Raphaël Leriche
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  4. Mircea Trif
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  5. François Debontridder
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  6. Dominique Demaille
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  7. Dimitri Roditchev
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  8. Pascal Simon
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  9. Tristan Cren
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Corresponding author

Correspondence to Pascal Simon.

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Ménard, G.C., Brun, C., Leriche, R. et al. Yu-Shiba-Rusinov bound states versus topological edge states in Pb/Si(111). Eur. Phys. J. Spec. Top. 227, 2303–2313 (2019). https://doi.org/10.1140/epjst/e2018-800056-3

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  • DOI: https://doi.org/10.1140/epjst/e2018-800056-3

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